There are 999 possible MARC tags, many of which have been established by the Library of Congress as fields in the various MARC formats.  The following lists each possible tag and, where applicable, its assigned usage in the Classification Data Format.

The Tag List groups the Variable Control Fields and Variable Data Fields.  The Variable Data Fields are subgrouped as follows:

Control Information, Numbers and Codes

Classification Numbers and Terms

Tracings and References

Notes

Index Terms

Number Building Fields

Other Variable Fields

Note:  Generally, any field containing a "9" (e.g., 049, 910, etc.) is available for local use, such as local call numbers, holdings, or subject headings.  Check with your system vendor for further information.

Leader

Directory

Variable Control Fields:

001  Control Number  (NR)

002  unassigned

003  Control Number Identifier  (NR)

004  unassigned

005  Date and Time of Latest Transaction  (NR)

006  unassigned

007  unassigned

008  Fixed-Length Data Elements  (NR)

009  unassigned

Variable Data Fields:

Control Information, Numbers and Codes:

010  Library of Congress Control Number  (NR)

011 - 015  unassigned

016  National Bibliographic Agency Control Number  (R)

017 - 033  unassigned

034  Coded Cartographic Mathematical Data  (R)

035  System Control Number  (R)

036 - 039  unassigned

040  Record Source  (NR)

041  unassigned

042  Authentication Code  (NR)

043  Geographic Area Code  (NR)

044 - 065  unassigned

066  Character Sets Present  (NR)

067 - 083  unassigned

084  Classification Scheme and Edition  (NR)

085 - 099  unassigned

Classification Numbers and Terms:

100 - 152  unassigned

153  Classification Number  (NR)

154  General Explanatory Index Term  (NR)

155 - 199  unassigned

Tracings and References:

200 - 252  unassigned

253  Complex See Reference  (R)

254 - 352  unassigned

353  Complex See Also Reference  (R)

354 - 452  unassigned

453  Invalid Number Tracing  (R)

454 - 552  unassigned

553  Valid Number Tracing  (R)

554 - 599  unassigned

Notes:

600 - 672  unassigned

673  Segmented Classification Number  (NR)

674  Segmentation Instruction  (R)

675 - 679  unassigned

680  Scope Note  (R)

681  Classification Example Tracing Note  (R)

682  unassigned

683  Application Instruction Note  (R)

684  Auxiliary Instruction Note  (R)

685  History Note  (R)

686  Relationship to Source Note  (R)

687 - 699  unassigned

Index Terms:

700  Index Term - Personal Name  (R)

701 - 709  unassigned

710  Index Term - Corporate Name  (R)

711  Index Term - Meeting Name  (R)

712 - 719  unassigned

720  Index Term - Uncontrolled Name  (R)

721 - 729  unassigned

730  Index Term - Uniform Title  (R)

731 - 747  unassigned

748  Index Term - Chronological  (R)

749  unassigned

750  Index Term - Topical  (R)

751  Index Term - Geographic Name  (R)

752  unassigned

753  Index Term - Uncontrolled  (R)

754  Index Term - Faceted Topical Terms  (R)

755 - 759  unassigned

Number Building Fields:

760  unassigned

761  Add or Divide Like Instructions  (R)

762  Table Identification  (R)

763  Internal Subarrangement or Add Table Entry  (R)

764  Rule Identification  (R)

765  Synthesized Number Components  (R)

766  Secondary Table Information  (R)

767  unassigned

768  Citation and Preference Order Instructions  (R)

769 - 799  unassigned

Other Variable Fields:

800 - 855  unassigned

856  Electronic Location and Access  (R)

857 - 879  unassigned

880  Alternate Graphic Representation  (R)

881 - 882 unassigned

883  Machine-generated Metadata Provenance  (R)

884 - 999  unassigned

See also:

Variable Control Fields

Variable Data Fields

MARC 21 Format for Classification Data:  Contents